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Most unsaturated fats are liquid at room temperature because a cis double bond:
AAdds extra oxygen atoms to the chain
BMakes the chain far shorter than usual
CPuts a kink that stops tight packing
DGives the chain a net electric charge
Answer & Solution
Correct answer: C. Puts a kink that stops tight packing
1. A cis double bond changes the shape of the hydrocarbon chain.
2. It causes a bend, or kink, in the chain.
3. That bend prevents the fatty acids from packing tightly together.
4. Loosely packed chains stay liquid, which is why such fats are called oils.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 3 'Biological Macromolecules', sections 3.1-3.5_
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